Thread-controlling mechanism for button-sewing machines.



II W. DARLEY, IR. THBEAD CONTROLLING MECHANISM FOR BUTTON SEWING MACHINES.

APPLICATION FILED FEB- 5, I906. RENEWED APR-22,1915- Patented June 15, 1915.

5 SHEETSSHEET I.

.I. W. DARLEY, IR.

THREAD CONTROLLING MECHANISM FOR BUTTON SEWING MACHINES. APPLICATION FILED FEB. 5, 1905. RENEWED APR. 22, 1915.

1,143,513. Patented June 15, 1915.

5 SHEETSSHEET 2.

THE NORRIS PETERS 60.. PHOTO-LITHQ, WASHINGIUN, D. Q

1..W. DARLEY, JR. THREAD CONTROLLING MECHANISM FDR BUTTON SEWING MACHINES.

APPLICATION FILED FEB- 5, 1906. RENEWED APR. 22. 1915.

1,143,513. Patented June 15, 1915.

5 SHEETS-SHEET 3.

THE NORRIS PETERS w. PHOTO-Tum, WASHINGTON, D, C.

J. W. DARLEY, JR. THREAD CONTROLLING MECHANISM FOR BUTTON SEWING MACHINES.

APPLICATION FILED FEB. 5, I906. RENEWED APR. 22. I915.

Patented June 15, 1915.

5 SHEETSSHEET 4.

CO., PHOTC LITHO. WASHINGTON, D. C

1. W. DARLEY, JR.

THREAD CONTROLLING MECHANISM FOR BUTTON SEWING MACHINES.

APPLICATION FILED FEB. 5, I906. RENEWED APR. 22. I915.

Patented June 15, 1915.

5 SHEETS-SHEET 5.

ImiillllIIIIIIIIIIIIIIIIIIIII" THE NORRIS PETERS c0 PHOTC-LITHQ, WASHING TON. D. C.

. .JOHN w. DARLEY, m, or BALTIMORE, MARYLAND.

THREAD-CONTROLLING MECHANISM FOR BUTTON -SEWIN G MACHINES;

Specification of Letters Patent.

Patented June 15, 1915.

Original application filed May 25, 1904, Serial No. 209,728. Divided and this application filed February 5, 1906, Serial No. 299,593. Renewed April 22, 1915. Serial No. 23,216.

To all whom it may concern Be it known that I, J OHN W. DARLnY, J r., a citizen of the United States, residing at Baltimore city, State of Maryland, have 1nvented certain new and useful Improvements in Thread-Controlling -Mechanism for Button-Sewing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the artto which it appertains to make and use the same.

y invention relates to improvements 1n thread controlling mechanism for button sewing machines, division of my former application, filed May 25, 190-1, Serial N 0. 209,728.

The object 'of my invention is to provide a device whereby in the operation of sewing a button 'onto a fabric by means of machine, the last stitch will be pulled tight, thus preventing any loose threads near the button.

With this object in View, my invention consists in the construction and combinations of parts as hereinafter described and claimed.

In the accompanying drawings ;F igure 1 is a side View showing a part of a sewing machine with my invention applied thereto. Fig. 2isa side view of the means for drawing the last stitch tight, parts of the machine being broken away. 7 Fig.3 is a partial end view taken from the opposite end. Fig. 4 is a View of a part of one end of the machine, showing the part of the mechanism for drawing the last stitch tight. Fig. 5 is a cross section through the bed plate of the machine, showing the tilting index pan and means for operating the thread tightening mechanism. Fig. 6 is a partialend View of the same, showing the cam and connected parts-for operating the thread tightening mechanism. Fig. 7 is a front view of one of the faces of the cam shown in Fig. 6, and Fig. 8 is a bottom plan view of the index pan, showing the means for throwing the operating cam.

In the drawings, a represents the base of the machine, and Z) and o the upright and horizontal arms. of the goose neck carrying the sewing devices. d represents the spool mounted upon a swinging wire e of the ordi? nary type. f represents one 'end of the goose neck 0 provided with a projecting perforated ear 9 and with a thread-take-up mechanism It, and with a bent wire 5,

this application being a ways keeps the end of the latter through which the thread passes, all of these parts being of the usual construction. The thread also passes through one end of a bent arm 1', which draws the thread tight with a sudden jerk when the job of sewing on a button is finished. The arm 3' is carried at one end of a rod lopivotally mounted in brackets m and n carried, the one by the goose neck, and the other by the frame of the machine.

0 represents an arm secured to the end of the rod is opposite to the arm j, both of these arms extendingdownward and in the same general direction from the rod is. It is obvious that an upward movement of the arm 0 will move the rod 70 and with it the arm 3', moving the latter upward with a quick jerk drawing the last stitch tight. A pin 29 is fixed to the bracket n to prevent the arm 0 from falling too far. I

The upward movement of the arm 0 to draw the last stitch tight is accomplished by means of the rod 9, which passes through and is guided by a perforation in the horizontal part of the bracket 12-. This rod 9 is lifted quickly and sharply. at the end of the sewing operation,

and this is accomplished in the following manner: 1" represents a shaft on which the driving pulley is mounted, and 8 represents a shiftable clutch on said shaft. By means, which are not shown in the present application, the clutch s is shifted quickly and sharply to the left at theclose of the sewing operation, and this causes the upward movement of the rod 9, the lower end of which is pivotally mounted on the horizontal arm 75 of a bell crank lever, the upper part of which lever is a vertical fork u carrying pins 12 which engage with an annular depression w in the shiftable clutch s. This bell crank leveris pivoted atyin aright angled bracket 2. A spring 1 surrounds the rod 9 tending to keep it in its lowest position. The weight ofthe arms j and 0 alin contact with the rod (1. The quick upward jerk of the arm j pulls the last loose stitch tight, as the jerk occurs between the needle thread tension 347 and the fabric, and this jerk occurs just as the sewing mechanism has finished its operation and the winding mechanism is about to be brought into operation.

As described in my aforesaid application, the sewing mechanism is first brought into operation, then the winding mechanism,

then the means for knotting the winding thread, and finally the thread severing accomplished by the means set forth in Figs.

5 to 8 of the drawing. I

c, Fig. 8, is the main shaft of the machine, and on this shaft is fastened a sleeve 91, provided with screw-threads 90, this part limiting the number of stitches taken by the needle.

44 represents a rod leading to a treadle,

not shown, for throwing the sewing mechanism into operation. The upper end of the rod 44 is hooked and passes through a hole in one arm 49 of a bellcrank lever, which is loosely mounted on a shaft 45, carried by ears 46 extending downwardly from the bed plate of the machine, near one side thereof. This bell crank lever is composed of a I long central portion 48, through which the shaft 45 passes, an outwardly projecting arm 49, to which the rod 44 is attached, and an inwardly projecting arm 50, nearly parallel to but not in the same plane with the arm 49.. The arm 50 terminates in an enlarged head 51, curved as shown at 52, and comin to a point, see Fig. 5. The arm 50 is provided with ratchet teeth 53, with which a spring pressed pawl 54 is adapted to engage, the teeth and pawl constituting a full stroke device, and preventing the return movement of the operating treadle after it has once been started in its movement, until sewing, winding and knot tightening operations have been finished, when the pawl will be disengaged from the teeth. After the sewing operation has once been started, the operation of the sewing mechanism, thread tightening mechanism, winding mechanism, and knot tightening mechanism are entirely automatic and beyond the control of the operator, depending wholly on the adjustments of the machine at the start. Y

The head 52 of the arm 50is composed of two parallel portions united by a flat por tion, forming quite a large trough, as indicated in dotted lines in Fig. 5. As the arm 49 is moved down by the treadle, the arm 50 is moved up until the pawl 54 engages the teeth 58, being thrown into connection therewith by means of the spring 59 on the shaft 83, which also supports the pawl 54., As the arm 501s thrownupward, it causes a partial rotation-of the cam: operating shaft 60 against the tension of the spring 61,

wound around said shaft, by the followingmeans :Within the trough in the head of,

the arm 50 is engaged the end of an arm 62,

which is 'firmly attached to the shaft 60 by any suitable means. The end of the arm 62 is enlarged, as shown at 64, so as to nearly fill the trough in the arm 50. In this arm 64 is journaled a pawl 65, nearly at right angles to the arm 62. The pawl 65 is pro-- vided at its rear end withan adjusting screw 70, against which va part hereinafter described is adapted to strike when the sewing operation is completed. Loosely mounted onithe shaft 60 is afsleeve 78, to which shaft it may be secured by the adjusting handle 75, operating a screw (not shown). Carried by the sleeve 78 is a projecting arm 79, preferably made integral therewith, and extending therefrom nearly at right angles.

-The arm 79 is provided with a pin 80,

shown in dotted lines in Fig. 8, which passes into a slot 81 in the tilting index pan 82. This index pan is provided with downwardly projecting sides journaled on the shaft 83, which shaft is located in bearings" on the inside of the bed plate on the-back thereof, and parallel to the shafts 60 and c.

Through the slot 81 also passes the index pin 84, which is adapted to engage with the screw-threads 90. On the under side ofsaid pan, the pin 84 passes through the junction of a three arm slide 88, the construction being that all these parts will freely slide along in the slot 81. By tilting the index pan so as to bring the pin 84 out of engagement with the screw and loosening the handle 75, the index pin may be adjusted along the screw 90 so as to cause the needle to take any number of stitches from two to twenty. Extending downwardly from the sleeve 78 is a pin 92, which is firmly fixed to said sleeve. On the pin 92 is loosely inounted a sleeve 93, a pin94 preventing the sleeve from dropping off thefpin 92. The sleeve 93 has secured to it, or made integral with it, another sleeve 95 at right angles thereto,

within which loosely works a rod 96. The

' other end of said rod is secured as follows Securedin the bottom of thebed plate is a pin 97, which passes through a slot 98 in the index pan, this slot being considerably larger than the pin 97. Onthe pin 97 is loosely mounted a sleeve 99, a pin 100 preventing the-sleeve from dropping ofi saidpin. This sleeve is provided with two projecting ears 101 and 102, whichare perfo rated for the passage therethrough of the rod 96, which is freely movable therein. A sleeve 103 is fixed to this rod, and is provided with a projection 104 to which a stout wire 105 is fastened, said wire traveling in the curved slot 106 in the index pan 82. At'

the other, or rear end, of the sleeve 103,

said sleeve'is provided with a projection 107, which fits down over the ear 101. *A lever v arm 108 is attached to the rod 96 and lo cated between the ears 101 and 102. -This lever arm is screwed or otherwise fastened positions with a pin 110 carried by the sleeve 09. A spring 111, shown in dotted lines in Fig. 8, normally keeps the pro ection in contact with said pin, limiting in one direction the movement of therod 96, the sleeve 103, the wire 105, and the lever arm 108. The wire 105 is for use in the button shifting mechanism and is merely shown in the present application to make the drawing comlete.

p As the shaft 0 is rotated, by power, the screw 90 drives the index pin 84 to the left, the slot 81 in the index pan guiding said pin. When the required number of stitches has been made, the arm 112 of the three arm slide 88 strikes the bolt in the pawl 65, disengaging said pawl, whereupon the spring 61 partially rotates the shaft 60 toward its original position.

The index pin 84 is brought into engagement with, and set free from, the driving screw 90 by means of the tilting index pan 82 mounted on the shaft 83, as already described. Bent pins 113 and 114 projecting downwardly from the bed plate, limit the downward movement of said pan, as shown in Fig. 5. This pan is provided with various slots, already described, and including the large slot 115, to afford clearance space for the upward movement for the end of the arm 50 and for the end of the arm 62. It also affords space for the working of the pawl 65. Said pan is also provided with a slot 116 to afford space for the operation of the spring 117, one end of which is fastened to said pan and the other end of which is fastened to a link 118 on the lever 86, which operates to return the three arm slide 88 in the index pan 82 to the initial position, ready for sewing on another button.

When the required number of stitches has been made, the power is shifted from the sewing mechanism to the winding mechanism by means of the C-lever shown in Fig. 6, and during this shifting operation the thread tightening mechanism is brought into operation.

Referring to Fig. 6, on the shaft 60 is fastened a long sleeve 127. On this sleeve 127, and preferably made integral therewith, is a C-lever 129, preferably provided with a central strengthening rib 130. This lever is fastened to the shaft 60 and encircles the driving shaft 0. Joining the open ends of the lever is the switch represents a pin passing through a suitable support on whichis mounted a yoke 137, provided with a bell crank extension u, made integral therewith. This yoke carries pins '0, which loosely engage in a of the rod 9,

' slackening said cam 131, Fig. 7. 136

groove on opposite sides of a pulley 142. Extending outwardly from the extension 138 is another pin 148, which engageswith the slot in the cam plate 131. The pulley 142 is shifted by appropriate means to throw the winding mechanism into operation after the sewing mechanism has finished its work, and at the same time the yoke 137 is shifted. The slot in the cam 131 is composed of a straight portion 149 and inclined portions 150 and .151, separated by a pivoted switch 270. The yoke 137 has extending outwardly from it a right angled portion 144, and in the end of this right angled portion is journaled a rod 9, which is supported in suitable guides on the end of the machine. The movement of the yoke 137 therefore causes an upward movement which at its top strikes the arm 0, which is rigidly attached to the shaft is extending over the top of the machine, to the other end of which the arm j is attached. It is evident, therefore, that a shifting of the C-lever from the position shown in dotted lines in Fig. 6 to that shown in full lines, would throw the rod 9 upwardly, lifting the arm 0 and giving the arm j, at the other end of the machine, a sharp upward jerk. The thread passes from the spool through thread guides and tension devices z', 9, n, t, it, is, passing on its way through a perforation in the arm j. By the construction described, it will be seen that the shifting from the sewing to the wind ing operation, causing an upward movement of the arm j, draws the last stitch tight.

I claim 1. In a button sewing machine, the combination of sewing mechanism, stop mechanism, a take-up, and additional means for pulling the loop of the sewing thread tight on the last stitch.

2. In a button sewing machine, the combination of sewing mechanism, stop mechanism, a take-up, and additional means for pulling the loop of the sewing thread tight on the stopping of said sewing mechanism.

3. In a button sewing machine, the combination of sewing mechanism, stop mechanism, a take-up, and additional means for pulling the loop of the sewing thread tight on the last stitch, said additional means also sewing thread before the next sewing operation is begun.

4. In a button sewing machine, the combination of sewing mechanism, a tension device therefor, an automatic stop mechanism for said sewing mechanism, and means operated by said stop mechanism for pulling up the last loop of the sewing thread independent of said tension device, substantially as described.

5. In a button sewing machine, the combination of sewing mechanism, tension devices and means for pulling tight the last loop made by the sewing mechanism, said means including a Vibrating arm, through one end of which the thread passes, a shaft on which said arm is mounted, a second arm secured to said shaft at its other end, and a movable device for striking the end of said second arm, to pull the thread tight with a jerk at the end of the sewing operation.

6. In a button sewing machine, the combination of sewing mechanism, operating means therefor, and means for automatically stopping at a predetermined time said operating means from operating said mechanism, with tension devices and means for pulling tight the last loop made by the sewing mechanism as it stops, including a vi- Copies of this patent may be obtained for five cents each, by addressing the JOHN W. DARLEY, JR.

WVitnesses: I

JoHN H. SANDLAS,

CHAs. A. NEUENHAHN.

Commissioner o1! Patents,

Washington. D. G. 

